Add support for Ollama, Palm, Claude-2, Cohere, Replicate Llama2, CodeLlama, Hugging Face (100+LLMs) - using LiteLLM

Add support for Ollama, Palm, Claude-2, Cohere, Replicate Llama2, CodeLlama, Hugging Face (100+LLMs) - using LiteLLM #1448